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<h1>Rotation Tool</h1>
<p>Rotation Tool is a primitive folding tool, but it can be useful sometimes and is easy to learn. What it does is quite straightforward: it creases the paper along the <a href="ruler.html">Ruler</a> and rotates the two sides relative to each other by the given angle.
<p>If the Ruler doesn't intersect the origami in a single line, rotation is not possible because there is no axis to rotate around. In this case, Rotation Tool still adds the crease lines, but does nothing after that. When this happens, Reflection Tool should be used instead.

<h2><a name=x1>Exercise 1</a></h2>
<ol>
<li>Move the mouse to the middle of the paper's top edge until a small black square appears:
<center><img src="rotationtool/01.png" width="60%" ></center>
This black square indicates that the <a href="snap.html">Snap to midpoints</a> option is on and the Ruler will be snapped exactly to the center of the top edge.</li>
<li><b>Right click</b> to activate the Ruler. Move the mouse to the middle of the bottom edge until another black square pops up:
<center><img src="rotationtool/02.png" width="60%" ></center></li>
<li><b>Right click</b> again. Choose <b>Rotate</b> from the popup menu.</b>
<center><img src="rotationtool/03.png" width="60%" ></center></li>
<li>The image of a protractor will appear. Move the mouse to the 90&deg; notch, then click with the <b>left mouse button</b>.
<center><img src="rotationtool/04.png" width="60%" ></center></li>
<li>You have folded the paper into a book shape.
<center><img src="rotationtool/05.png" width="60%" ></center></li>
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<h2>Exercise 2</h2>
This exercise will show you a typical situation where Rotation Tool is not suitable.
<ol>
<li>Proceed with the same 90&deg; folded paper you made in the first exercise. Place the ruler crosswise through the middle folding line, and click <b>Rotate</b>.
<center><img src="rotationtool/06.png" width="60%" ></center></li>
<li>Choose an angle on the protractor.
<center><img src="rotationtool/07.png" width="60%" ></center></li>
<li>The paper will be creased but not moved anywhere.
<center><img src="rotationtool/08.png" width="60%" ></center>
Rotation Tool doesn't work on this folding line because it would tear the paper apart. In the next chapter, you will learn how to solve this problem.</li>
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